RELATIONSHIP BETWEEN RESPIRATORY PERIOD AND RESPIRATORY CARDIAC CYCLE VARIABILITY

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  • SONE RYOKO
    <I>University of Tsukuba, Doctoral Program in Health and Sports Sciences</I>
  • FUKUOKA YOSHIYUKI
    <I>University of Tsukuba, Doctoral Program in Health and Sports Sciences</I>
  • YAMAZAKI FUMIO
    <I>University of Tsukuba, Doctoral Program in Health and Sports Sciences</I>
  • HOMMA SACHIKO
    <I>University of Tsukuba, Institute of Health and Sports Sciences</I>
  • IKEGAMI HARUO
    <I>University of Tsukuba, Institute of Health and Sports Sciences</I>

Bibliographic Information

Other Title
  • 呼吸周期と心周期の呼吸性変動との関係
  • 呼吸周期と心周期の呼吸性変動との関係--血圧の呼吸性変動の影響
  • コキュウ シュウキ ト シン シュウキ ノ コキュウセイ ヘンドウ ト ノ カ
  • —THE INFLUENCE OF RESPIRATORY BLOOD PRESSURE VARIABILITY—
  • ―血圧の呼吸性変動の影響―

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This study was undertaken to clarify the influence of respiratory blood pressure variability upon the relationship between respiratory period and respiratory cardiac cycle variability. In 4 healthy male university students respiratory period was varied over the range of 6-20 sec while tidal volume was maintained constant (21) and in 5 other male students tidal volume was varied over the range of 1.0-2.5l while respiratory period was maintained constant (6 sec) . For cardiac cycle (RR) and systolic and diastolic blood pressure (SBP and DBP), amplitude of respiratory variability and phase difference between respiratory variability and respiration were measured.<BR>1. Patterns of change of amplitude of RR and of SBP were similar when respiratory period was changed.<BR>2. When respiratory period was short (6sec), RR was nearly in phase with SBP. However, as respiratory period increased, the phases of RR and SBP had a tendency to proceed, with the tendency being more pronounced in the latter. Thus, when respiratory period was prolonged (20 sec), SBP led RR.<BR>3. Phase relationship between respiratory SBP variability and respiration did not change when tidal volume was changed.<BR>4. Respiratory DBP variability became more marked as respiratory period increased, and showed more marked phase shift than did respiratory SBP variability. Therefore, of those parameters DBP occurred earlier.<BR>Based on these results, it is concluded that respiratory RR variability is closely related to respiratory SBP variability when respiratory period is changed, but that the phase difference between RR and SBP reflects the effect of pulmonary stretch reflex which is dependent on respiratory period.

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